Synonyms of 'decelerate'
1 slow down or up
The driver kept accelerating and decelerating.
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When a vehicle or its driver brakes, or when a driver brakes a vehicle, the driver makes it slow down or stop by using the brakes.
She braked to a halt and switched off.
Thesaurus for decelerate from the Collins English Thesaurus
When a vehicle or machine decelerates or when someone in a vehicle decelerates , the speed of the vehicle or machine is reduced .